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Long-term torsional creep in compact bone

R Lakes, S Saha

    Journal of Biomechanical Engineering
    |May 1, 1980
    PubMed
    Summary

    Bovine bone subjected to torsion over extended periods shows significant time-dependent mechanical changes. These findings highlight crucial aspects of bone material behavior under prolonged stress, independent of solution immersion.

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    Area of Science:

    • Biomaterials Science
    • Orthopedic Biomechanics
    • Materials Science

    Background:

    • Bone is a complex biological composite material.
    • Understanding bone's mechanical properties is crucial for orthopedic applications and fracture healing.
    • Time-dependent mechanical behaviors, such as creep, are important considerations for bone under sustained loading.

    Purpose of the Study:

    • To investigate the time-dependent mechanical effects on bovine bone specimens under torsional loading.
    • To quantify the extent of strain changes and identify failure modes over extended periods.
    • To determine if immersion in Ringer's solution influences these time-dependent effects.

    Main Methods:

    • Bovine bone specimens were subjected to torsional loading.
    • Specimens were maintained under load for durations exceeding one month.
    • Strain measurements were recorded to assess time-dependent deformation.
    • Failure modes, including creep failure, were observed and documented.

    Main Results:

    • Pronounced time-dependent effects were observed in bovine bone specimens loaded in torsion for over one month.
    • Final strain levels significantly exceeded initial strain, with increases of over 400% in some instances.
    • Creep failure, a form of mechanical failure due to long-term material deformation, was observed in two specimens.
    • These observed mechanical changes were not attributed to prolonged immersion in Ringer's solution.

    Conclusions:

    • Bovine bone exhibits significant time-dependent mechanical behavior under prolonged torsional loading.
    • Creep and substantial strain accumulation are critical failure mechanisms to consider in biomechanical analyses of bone.
    • The observed phenomena are intrinsic material properties of bone under sustained torsion and not artifacts of the experimental solution.

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